{"id":"UBUNTU-CVE-2026-4897","details":"A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.","modified":"2026-04-22T16:34:47.702456Z","published":"2026-03-26T15:16:00Z","related":["USN-8173-1"],"upstream":["CVE-2026-4897"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4897"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-4897"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-4897"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8173-1"}],"affected":[{"package":{"name":"policykit-1","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@0.105-4ubuntu3.14.04.6+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.105-3ubuntu3","0.105-4ubuntu1","0.105-4ubuntu2","0.105-4ubuntu2.14.04.1","0.105-4ubuntu3.14.04.1","0.105-4ubuntu3.14.04.2","0.105-4ubuntu3.14.04.5","0.105-4ubuntu3.14.04.6","0.105-4ubuntu3.14.04.6+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"gir1.2-polkit-1.0","binary_version":"0.105-4ubuntu3.14.04.6+esm1"},{"binary_name":"libpolkit-agent-1-0","binary_version":"0.105-4ubuntu3.14.04.6+esm1"},{"binary_name":"libpolkit-backend-1-0","binary_version":"0.105-4ubuntu3.14.04.6+esm1"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"0.105-4ubuntu3.14.04.6+esm1"},{"binary_name":"policykit-1","binary_version":"0.105-4ubuntu3.14.04.6+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}},{"package":{"name":"policykit-1","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@0.105-14.1ubuntu0.5+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.105-11ubuntu2","0.105-13","0.105-13ubuntu1","0.105-14","0.105-14.1","0.105-14.1ubuntu0.1","0.105-14.1ubuntu0.4","0.105-14.1ubuntu0.5","0.105-14.1ubuntu0.5+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.105-14.1ubuntu0.5+esm1","binary_name":"gir1.2-polkit-1.0"},{"binary_name":"libpolkit-agent-1-0","binary_version":"0.105-14.1ubuntu0.5+esm1"},{"binary_name":"libpolkit-backend-1-0","binary_version":"0.105-14.1ubuntu0.5+esm1"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"0.105-14.1ubuntu0.5+esm1"},{"binary_name":"policykit-1","binary_version":"0.105-14.1ubuntu0.5+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}},{"package":{"name":"policykit-1","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@0.105-20ubuntu0.18.04.6?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.105-18","0.105-20","0.105-20ubuntu0.18.04.1","0.105-20ubuntu0.18.04.4","0.105-20ubuntu0.18.04.5","0.105-20ubuntu0.18.04.6"],"ecosystem_specific":{"binaries":[{"binary_name":"gir1.2-polkit-1.0","binary_version":"0.105-20ubuntu0.18.04.6"},{"binary_name":"libpolkit-agent-1-0","binary_version":"0.105-20ubuntu0.18.04.6"},{"binary_name":"libpolkit-backend-1-0","binary_version":"0.105-20ubuntu0.18.04.6"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"0.105-20ubuntu0.18.04.6"},{"binary_version":"0.105-20ubuntu0.18.04.6","binary_name":"policykit-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}},{"package":{"name":"policykit-1","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@0.105-26ubuntu1.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.105-26ubuntu1","0.105-26ubuntu1.1","0.105-26ubuntu1.2","0.105-26ubuntu1.3"],"ecosystem_specific":{"binaries":[{"binary_name":"gir1.2-polkit-1.0","binary_version":"0.105-26ubuntu1.3"},{"binary_name":"libpolkit-agent-1-0","binary_version":"0.105-26ubuntu1.3"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"0.105-26ubuntu1.3"},{"binary_name":"policykit-1","binary_version":"0.105-26ubuntu1.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}},{"package":{"name":"policykit-1","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@0.105-33ubuntu0.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.105-33ubuntu0.1"}]}],"versions":["0.105-31","0.105-31ubuntu1","0.105-31.1","0.105-32","0.105-33"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gir1.2-polkit-1.0","binary_version":"0.105-33ubuntu0.1"},{"binary_name":"libpolkit-agent-1-0","binary_version":"0.105-33ubuntu0.1"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"0.105-33ubuntu0.1"},{"binary_version":"0.105-33ubuntu0.1","binary_name":"pkexec"},{"binary_name":"policykit-1","binary_version":"0.105-33ubuntu0.1"},{"binary_name":"polkitd","binary_version":"0.105-33ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}},{"package":{"name":"policykit-1","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/policykit-1@124-2ubuntu1.24.04.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"124-2ubuntu1.24.04.3"}]}],"versions":["123-1","123-3","124-1","124-1ubuntu1","124-2ubuntu1","124-2ubuntu1.24.04.2"],"ecosystem_specific":{"availability":"No subscription 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required","binaries":[{"binary_name":"gir1.2-polkit-1.0","binary_version":"126-2ubuntu0.1"},{"binary_name":"libpolkit-agent-1-0","binary_version":"126-2ubuntu0.1"},{"binary_name":"libpolkit-gobject-1-0","binary_version":"126-2ubuntu0.1"},{"binary_name":"pkexec","binary_version":"126-2ubuntu0.1"},{"binary_name":"polkitd","binary_version":"126-2ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4897.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}